1221152 has 24 divisors (see below), whose sum is σ = 2483712. Its totient is φ = 590400.

The previous prime is 1221131. The next prime is 1221163. The reversal of 1221152 is 2511221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377 + ... + 1607.

It is an arithmetic number, because the mean of its divisors is an integer number (103488).

2^1221152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1241856).

1221152 is an abundant number, since it is smaller than the sum of its proper divisors (1262560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221152 is a wasteful number, since it uses less digits than its factorization.

1221152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272 (or 1264 counting only the distinct ones).

The product of its digits is 40, while the sum is 14.

The square root of 1221152 is about 1105.0574645692. The cubic root of 1221152 is about 106.8865948457.

Adding to 1221152 its reverse (2511221), we get a palindrome (3732373).

The spelling of 1221152 in words is "one million, two hundred twenty-one thousand, one hundred fifty-two".